Hello,


Attempting my first "rebuild" on an older bike I own. Of course running into a few issues as I proceed. Primarily right now is the wheel+power meter+groupset compatibility.

I bought and working on installing Campagnolo Zonda C17 wheels and a SRM Dura Ace 7800 Power meter. Everything else I have had minimal issues installing


The bike has a mid 2000s Campagnolo Mirage groupset. FSA Gossamer, 34/50 teeth and FSA Mega EXO


The duraace7800 unfortunately doesn't fit with the front chain rings either so I at least need new ones for sure. However my main concern is that the duraace is not compatibile with the campagnolo groupset currently on the bike.


If the compatibility is not there I'd prefer to focus on keeping the wheels and getting a different PM that is compatible while keeping the campgnolo groupset+wheels.


If there's anything needed to help understand the issues I am running into just let me know so i can post the info.

A Shimano crank should work just fine with Campagnolo components. You see brand new bikes that are sold with off brand cranksets all over the place. If anything, the crank may work better than the original one

The chain will run through the chainrings fine, but spacing between the Shimano rings is a little deeper. You will have trouble hitting the big ring in one sweep of the Campagnolo shift lever.

okay yea idk why that freaked me out yesterday on the compatability of the power meter and groupset and I swore I made sure it was compatabile with my computer and groupset before along with the wheels but I guess it was a slight moment of panic.

Now in terms of the dura ace 7800 would it then be possibly to get a campagnolo 50/34t 130 bcd inner and outer chainrings that would fit on? so that it works a bit better with the rest of the groupset. I didn't really plan to change too much in the groupset as I felt that was a bit too much out of my capabilities to start with besides a new chain as the current is just a very old KMC, 1/2 x 3/32"

appreciate it guys

No Campagnolo chainring can possibly fit on a Shimano road crank. Even then, no crank with a 130mm BCD can accept a 34 tooth chainring. The smallest possible chainring to fit a 130mm BCD is 38 teeth and those are really hard to find. I found one for my 130mm BCD Mavic crank a couple of years ago and I had to search multiple sites to find a vendor who had one

Loads of 38 tooth chainrings on eBay UK, look up TA or Stronglight.

If you still have to get these parts, why don't you just look for and get parts from the same groupset and if not the same groupset, then from the same manufacturer. You'll eliminate a lot of incompatibilities just by that alone. But there still is a good chance even then you'll have a compatibility problem.

All the manufacturer's give you information to figure out what is compatible with what. Shimano makes it readily available on their tech doc site.

I have the new cranks and wheels but not the new chainrings/chain, I guess I could save the hassle and resell the dura ace and get a compatible one and keep the chainrings.

So it seems the options are:

1) different cranks 110 bcd to use original 50/34 chainring thats already compatible with my cassette/chain etc.

2) unlikely but find a 50/34 130 bcd chainring?

3) switch to a 53/39 130 bcd and keep the crankset

and then another factor would be do I want to have to go to a 53/39 compared to 50/34 which fits where I live better and what I'm use to in terms of higher cadence needed.

I'd prefer to not have to resell and buy a new crankset to fit the original chainrings but I can afford to do so if it will be much easier.

Option 2 is impossible, the smallest possible chainring for a 130mm BCD crank is 38 teeth

so then it looks like 1 or 3

1 and 3? Sure, you'll have a bike. But a 50/34 of choice 1 vs a 53/39 of choice 3 means you really have no idea what gearing you want or need on the bike.

Might need to figure that out along with some other things.

Not trying to be a smart ass to your concerns, but your naiveite towards your build is lacking a purpose for what the end product is to be. So far it looks like it'll be a bike with all the pieces parts. Likely not a bike that addresses any particular cycling ability you have or don't have.

"and then another factor would be do I want to have to go to a 53/39 compared to 50/34 which fits where I live better and what I'm use to in terms of higher cadence needed"

i did already say i wasn't sure about having to switch to a 53/39, that would be the biggest chainring i've ridden before, but i'd consider it as having to not get a new crankset to keep the original 50/34 chainrings and its not my primary bike